Independent guide. We are not Spreadsheet KakoBuy or oopbuy.com — the spreadsheet we review lives here

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9 calculators · nothing to install

Calculators that do the boring arithmetic

Volumetric weight, landed cost, size conversion, QC checklists, consolidation maths. Every rate is a sample you can edit, and every formula is printed on the page so you can check our work rather than trust it.

Suggested order

Use them in this sequence

Each one feeds the next, which is why the numbers line up.

  1. 1

    Measure the item, not the photo

    Grams on a scale, centimetres with a tape. Guessing at this step is where every later number inherits the error.
  2. 2

    Check volumetric weight

    A light bulky item can cost more than a heavy small one. This is the most common surprise on a first haul.
  3. 3

    Build the landed cost

    Goods, fee, freight, duty. The number you should actually compare against retail is the landed one.
  4. 4

    Verify with a QC checklist

    Before you approve shipping, run the checklist so you know what you are accepting.

Numbers need something to attach to

Run the estimate, then put a real row through it. The catalogue is the row.

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